The 41-year-old, who has led Barça to 13 trophies since taking the reigns at Camp Nou in 2008, is set to explain his decision at a news conference at 1230BST.
Guardiola’s men were dumped out of the Champions League by Chelsea in midweek, three days after Real Madrid all but clinched the La Liga title with a 2-1 victory at Camp Nou.
It is understood that Guardiola will take a year-long break from the game.
Guardiola spent three hours with Barça president Sandro Rosell on Thursday and informed his players of his decision to quit on Friday morning.
• As a player, Guardiola came up through Barcelona’s youth ranks to win six Spanish Liga titles, one European Champion Clubs’ Cup, a Uefa Cup Winners’ Cup and two Copa del Rey trophies from 1990 to 2001.
• He also had spells with Brescia, Fabio Capello’s Roma, Al-Ahly in Doha and Mexico’s Dorados de Sinola before ending his playing career in 2006.
• He won 40 caps and Olympic footballing gold with Spain in 1992, but missed the 1998 and 2002 World Cup tournaments through injury.
• Having coached Barcelona’s B team, became the 15th Catalan-born boss of the senior team in 2008 and won the Champions League, Spanish Liga and Copa del Rey in his first season in charge.
• Success in the 2008-09 final made Guardiola the sixth man to lift the European Cup as a player and a coach. Barcelona followed up with victories in the Spanish and Uefa Super Cups at the start of 2009-10, going on to win the Fifa Club World Cup and retain the Liga title.
• He steered the Azulgrana to a third successive Liga crown and their fourth European Cup in 2010-11.
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